Apparatus

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sensors Mode-S transponder

A4870D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N391FR · AIRBUS A-320neo · operated by BANK OF UTAH TRUSTEE

Hex
A4870D
Octal
51103415
Decimal
10,782,477
Country
US
Tail
N391FR
Type
A20N
No current signal · last broadcast Jul 26, 20:25 UTC
Flights observed
571
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:25 UTC

Last known position

Most recent position reported by Mode-S A4870D.

Country allocation

The ICAO 24-bit address A4870D falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
FFT2410 - 7 2026-07-12
FFT4685 Frontier Airlines 6 2026-06-25
FFT3624 - 6 2026-06-27
FFT3021 Frontier Airlines 6 2026-06-15
FFT2467 - 6 2026-07-15
FFT1746 - 6 2026-06-23
FFT1426 Frontier Airlines 6 2026-05-27
FFT1270 - 6 2026-06-15
FFT4602 - 5 2026-07-11
FFT4401 Frontier Airlines 5 2026-07-19
FFT3224 Frontier Airlines 5 2026-06-15
FFT1342 Frontier Airlines 5 2026-06-16
FFT1085 Frontier Airlines 5 2026-04-29
FFT4725 - 4 2026-06-23
FFT4076 - 4 2026-07-10
FFT3999 - 4 2026-06-16
FFT3942 - 4 2026-06-17
FFT3454 - 4 2026-07-10
FFT3453 - 4 2026-07-11
FFT3383 Frontier Airlines 4 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FFT3312 DEN → MCO Jul 26, 16:45 UTCJul 26, 20:20 UTC3h 35m
2026-07-26 FFT1376 PHX → DEN Jul 26, 13:40 UTCJul 26, 15:05 UTC1h 25m
2026-07-26 FFT1819 DEN → PHX Jul 26, 00:15 UTCJul 26, 01:40 UTC1h 25m
2026-07-25 FFT4766 PHX → DEN Jul 25, 20:45 UTCJul 25, 22:20 UTC1h 35m
2026-07-25 FFT4766 PHX → DEN Jul 25, 20:28 UTCJul 25, 22:07 UTC1h 39m
2026-07-22 FFT2105 DEN → PHX Jul 22, 17:55 UTCJul 22, 19:20 UTC1h 25m
2026-07-22 FFT2549 DFW → DEN Jul 22, 14:20 UTCJul 22, 15:50 UTC1h 30m
2026-07-22 FFT2550 DEN → DFW Jul 22, 11:15 UTCJul 22, 12:45 UTC1h 30m
2026-07-22 FFT2550 DEN → DFW Jul 22, 11:18 UTCJul 22, 12:43 UTC1h 25m
2026-07-22 FFT777 DEN → LAS Jul 22, 04:55 UTCJul 22, 05:25 UTC30m
2026-07-22 FFT777 DEN → LAS Jul 22, 04:42 UTCJul 22, 06:18 UTC1h 36m
2026-07-22 FFT1994 LAS → DEN Jul 22, 01:55 UTCJul 22, 03:20 UTC1h 25m
2026-07-21 FFT2575 SLC → LAS Jul 21, 20:05 UTCJul 21, 21:10 UTC1h 5m
2026-07-21 FFT2575 SLC → LAS Jul 21, 19:59 UTCJul 21, 21:03 UTC1h 4m
2026-07-21 FFT1268 LAX → SLC Jul 21, 17:25 UTCJul 21, 18:50 UTC1h 25m
2026-07-21 FFT3291 LAS → LAX Jul 21, 15:25 UTCJul 21, 16:05 UTC40m
2026-07-21 FFT4242 MIA → MDW Jul 21, 06:25 UTCJul 21, 07:20 UTC55m
2026-07-21 FFT4241 MDW → MIA Jul 21, 04:20 UTCJul 21, 05:10 UTC50m
2026-07-21 FFT2070 SFO → LAS Jul 21, 01:45 UTCJul 21, 02:50 UTC1h 5m
2026-07-20 FFT3315 - Jul 20, 23:25 UTCJul 21, 00:25 UTC59m
2026-07-20 FFT2263 ATL → TPA Jul 20, 21:25 UTCJul 20, 22:10 UTC45m
2026-07-20 FFT2232 ONT → LAS Jul 20, 19:05 UTCJul 20, 19:45 UTC40m
2026-07-20 FFT2678 HAF → ONT Jul 20, 17:05 UTCJul 20, 18:00 UTC55m
2026-07-20 FFT2678 SFO → ONT Jul 20, 17:01 UTCJul 20, 17:59 UTC58m
2026-07-20 FFT3019 LAS → SFO Jul 20, 15:05 UTCJul 20, 16:05 UTC1h 0m
2026-07-20 FFT3738 SNA → LAS Jul 20, 03:40 UTCJul 20, 04:25 UTC45m
2026-07-20 FFT3582 SFO → SNA Jul 20, 01:25 UTCJul 20, 02:35 UTC1h 10m
2026-07-19 FFT4401 LAS → SFO Jul 19, 23:05 UTCJul 20, 00:15 UTC1h 10m
2026-07-19 FFT4158 SFO → LAS Jul 19, 19:45 UTCJul 19, 20:50 UTC1h 5m
2026-07-19 FFT1159 ONT → SFO Jul 19, 17:15 UTCJul 19, 18:20 UTC1h 5m
2026-07-19 FFT1283 LAS → ONT Jul 19, 14:10 UTCJul 19, 14:45 UTC35m
2026-07-19 FFT1965 IAH → LAS Jul 19, 02:30 UTCJul 19, 05:05 UTC2h 35m
2026-07-18 FFT1966 - Jul 18, 21:50 UTCJul 19, 00:35 UTC2h 45m
2026-07-18 FFT1850 - Jul 18, 19:00 UTCJul 18, 20:05 UTC1h 5m
2026-07-18 FFT1159 - Jul 18, 16:15 UTCJul 18, 17:15 UTC1h 0m
2026-07-18 FFT1283 LAS → ONT Jul 18, 14:10 UTCJul 18, 14:45 UTC35m
2026-07-18 FFT1965 IAH → LAS Jul 18, 02:19 UTCJul 18, 04:55 UTC2h 36m
2026-07-18 FFT1965 IAH → LAS Jul 18, 01:56 UTCJul 18, 04:59 UTC3h 3m
2026-07-17 FFT1966 - Jul 17, 22:20 UTCJul 18, 01:00 UTC2h 40m
2026-07-17 FFT4158 SFO → LAS Jul 17, 19:35 UTCJul 17, 20:50 UTC1h 15m
2026-07-17 FFT4158 SFO → LAS Jul 17, 19:18 UTCJul 17, 20:41 UTC1h 23m
2026-07-17 FFT1159 - Jul 17, 17:30 UTCJul 17, 18:29 UTC1h 0m
2026-07-17 FFT1283 LAS → ONT Jul 17, 14:04 UTCJul 17, 14:39 UTC35m
2026-07-17 FFT3923 - Jul 17, 00:40 UTCJul 17, 04:10 UTC3h 30m
2026-07-16 FFT3046 MSP → ATL Jul 16, 20:55 UTCJul 16, 23:05 UTC2h 10m
2026-07-16 FFT3045 ATL → MSP Jul 16, 17:25 UTCJul 16, 19:30 UTC2h 5m
2026-07-16 FFT2297 - Jul 16, 12:44 UTCJul 16, 14:15 UTC1h 30m
2026-07-16 FFT2297 PHL → PHL Jul 16, 12:20 UTCJul 16, 12:25 UTC5m
2026-07-16 FFT1004 ATL → PHL Jul 16, 09:40 UTCJul 16, 11:25 UTC1h 45m
2026-07-15 FFT2144 - Jul 15, 17:20 UTCJul 15, 18:55 UTC1h 35m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N391FR page for operator, model, and routing details .

Mode-S A4870D frequently asked

What is Mode-S code A4870D?
A4870D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N391FR.
Where is Mode-S A4870D registered?
Mode-S code A4870D is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A4870D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4870D, octal 51103415, decimal 10,782,477.
What flights does A4870D operate?
Mode-S A4870D has broadcast 20 distinct callsigns, including FFT2410, FFT4685, FFT3624, FFT3021, FFT2467.